I developed a new SOTA-related MS Windows software program and am making it available free of charge to anyone who wants it. You can learn more about the software and download it from here:
In brief, SOTA Spot Monitor is similar to a DX Cluster client program but is dedicated to SOTA spots. It can check for new spots at a high rate (every few seconds) but completely avoids placing any additional loading on the SOTA servers by retrieving spots from the SOTAwatch feed on Twitter.com. SOTA Spot Monitor has been tested on Windows 7, Windows Server 2003 and Windows XP. It likely works on other 32-bit and 64-bit versions of MS Windows as well.
Features include configurable filters and audio alerts. Filters can operate based on summit/region/association/country, activator call, band, mode, points or spotter call. The filters can be applied to the audio alerts, the spot list display, or both. The spot list features drill-down capability to the summit information page at Sotawatch.org, or to the QRZ.com page for callsign lookups. Spot logging can be enabled and custom audio alerts (per-activator, region, association or country) are supported.